// Emacs style mode select	 -*- C++ -*-
//-----------------------------------------------------------------------------
//
// $Id:$
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This source is available for distribution and/or modification
// only under the terms of the DOOM Source Code License as
// published by id Software. All rights reserved.
//
// The source is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
// for more details.
//
// DESCRIPTION:
//		Lookup tables.
//		Do not try to look them up :-).
//		In the order of appearance:
//
//		int finetangent[4096]	- Tangens LUT.
//		 Should work with BAM fairly well (12 of 16bit,
//		effectively, by shifting).
//
//		int finesine[10240]				- Sine lookup.
//		 Guess what, serves as cosine, too.
//		 Remarkable thing is, how to use BAMs with this?
//
//		int tantoangle[2049]	- ArcTan LUT,
//		  maps tan(angle) to angle fast. Gotta search.
//
//-----------------------------------------------------------------------------


#ifndef __TABLES__
#define __TABLES__



#ifdef LINUX
#include <math.h>
#else
#define PI								3.141592657
#endif


#include "m_fixed.h"

#define FINEANGLES				8192
#define FINEMASK				(FINEANGLES-1)


// 0x100000000 to 0x2000
#define ANGLETOFINESHIFT		19

// Effective size is 10240.
extern	fixed_t			finesine[5*FINEANGLES/4];

// Re-use data, is just PI/2 pahse shift.
extern	fixed_t*		finecosine;


// Effective size is 4096.
extern fixed_t			finetangent[FINEANGLES/2];

// Binary Angle Measument, BAM.
#define ANG45					0x20000000
#define ANG90					0x40000000
#define ANG180			0x80000000
#define ANG270			0xc0000000


#define SLOPERANGE				2048
#define SLOPEBITS				11
#define DBITS					(FRACBITS-SLOPEBITS)

typedef unsigned angle_t;


// Effective size is 2049;
// The +1 size is to handle the case when x==y
//	without additional checking.
extern angle_t			tantoangle[SLOPERANGE+1];


// Utility function,
//	called by R_PointToAngle.
int
SlopeDiv
( unsigned		num,
  unsigned		den);


#endif
//-----------------------------------------------------------------------------
//
// $Log:$
//
//-----------------------------------------------------------------------------
